- Based on Natural Earth 1:50m cultural admin 0 countries (accessed 1 December 2021)
- The following steps were applied using https://mapshaper.org/
- Simplified to 30%, selecting "prevent shape removal"
- Deleted Antarctica
- Ran the following console commands:
filter-fields NAME_LONG,SUBREGIONrename-fields 'area_id=NAME_LONG,area_description=SUBREGION'
- The following features (GISAID values shown) were substituted from Natural Earth 1:50m cultural admin 0 map units (accessed 2 December 2021), processed as above.
- French Guiana
- Guadeloupe
- Martinique
- Mayotte
- Reunion
- The following alterations were made to allow data linkage. The GISAID value is used as the identifier and the Natural Earth value is used as the display value.
| GISAID (`area_id`) | Natural Earth NAME_LONG (`area_name`) |
|---|---|
| Brunei | Brunei Darussalam |
| Cabo Verde | Republic of Cabo Verde |
| Cote d'Ivoire | Côte d'Ivoire |
| Curacao | Curaçao |
| Eswatini | Swaziland |
| Faroe Islands | Faeroe Islands |
| Gambia | The Gambia |
| Laos | Lao PDR |
| Reunion | Réunion |
| Saint Barthelemy | Saint-Barthélemy |
| Saint Martin | Saint-Martin |
| Slovak Republic | Slovakia |
| South Korea | Republic of Korea |
| The Bahamas | Bahamas |
| USA | United States |
| U.S. Virgin Islands | United States Virgin Islands |